CVE-2020-15633: This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-L

Q: How do I fix CVE-2020-15633?

dir-867 firmware: upgrade to newer than 1.20b10; dir-878 firmware: upgrade to newer than 1.20b05; dir-882 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2020-15633 being exploited?

CVE-2020-15633 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-15633 affect?

CVE-2020-15633 affects dir-867 firmware, dir-878 firmware, dir-882 firmware. Severity is high (CVSS 8.8). This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.20B10_BETA. Authentication is not required to exploit this vulnerability

This month

HIGH 8.8UPGRADEUPGRADEMITIGATE

CVE-2020-15633 is a high-severity flaw (CVSS 8.8) affecting dir-867 firmware, dir-878 firmware, dir-882 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.20B10_BETA. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of HNAP requests. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to escalate pr

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-288
Published	2020-07-23
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: d-link

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-07-23 21:15 UTCPublished CVE record published
2026-06-17 02:56 UTCUpdated Record last modified

d-link dir-867 firmware UPGRADE

Affected: <= 1.20b10

Fixed in: newer than 1.20b10

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

d-link dir-878 firmware UPGRADE

Affected: <= 1.20b05

Fixed in: newer than 1.20b05

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

d-link dir-882 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-15633?

dir-867 firmware: upgrade to newer than 1.20b10; dir-878 firmware: upgrade to newer than 1.20b05; dir-882 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-15633 being exploited?

CVE-2020-15633 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-15633 affect?

CVE-2020-15633 affects dir-867 firmware, dir-878 firmware, dir-882 firmware. Severity is high (CVSS 8.8). This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.20B10_BETA. Authentication is not required to exploit this vulnerability

How urgent is CVE-2020-15633?

Priority 53/100. High severity

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2025-6334 HIGH 8.8 MITIGATE A vulnerability has been found in D-Link DIR-867 1.0 and classified as critical
CVE-2023-24762 CRITICAL 9.8 MITIGATE OS Command injection vulnerability in D-Link DIR-867 DIR_867_FW1.30B07 allows attackers to execute arbitrary c
CVE-2022-41140 HIGH 8.8 UPGRADE UPGRADE This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of mu
CVE-2020-8864 HIGH 8.8 UPGRADE UPGRADE This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-L
CVE-2020-8863 HIGH 8.8 UPGRADE UPGRADE This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-L

References

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